Suppose I have an array of differently shaped strings, such as this:
a =: 'foo';'z';'quux' Now I'd like to concatenate its open elements, to get 'foozquux'. The problem here is that I can't just open the array and do something after that, as that would bring the strings to a common size. Thus, I have to do this: >,&.>/ a There's however a problem with this. It's very slow for large arrays: 10(6!:2) '>,&.>/ ,1000 1$ a' 0.0014051 10(6!:2) '>,&.>/ ,10000 1$ a' 0.0836255 10(6!:2) '>,&.>/ ,100000 1$ a' 26.6436 It appears that the slowdown is quadratic, which may be because the string gets copied after each string is concatenated to it. I'd like to see a faster solution for this, possibly using special codes. ambrus ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
